Four strains, belonging to four genera, Burkholderia sp. SS5 (Fig. 4a–d), Klebsiella sp. SS2 (Fig. 4e–h), Novosphingobium
sp. TR4 (Fig. 4i–l) and Sphingomonas sp. PS5 (Fig. 4m–p) marked with GUS were selected to use for investigating rice colonization.